When we preach in the church, even I as a Vicar, we preach to a people who are trying to figure out what their being Baptized means.  What does it mean to be in this distinctive community called the Christian Church?  I believe we are to preach with this in mind.  We are not preaching with the mindset that there is potentially someone there who has no idea what this place is and what will be said, but that the people who are there are still thirsty to know what being a Christian looks like in this constantly changing world.  They are hungry and thirsty for righteousness.